Fan assembly and vacuum cleaner having same

Abstract

Provided are a fan assembly and a vacuum cleaner having same. The fan assembly includes a housing, an impeller assembly, and a driving member. At least part of the impeller assembly is accommodated in the housing. The impeller assembly includes a plurality of impellers connected in series in an airflow flowing direction of the fan assembly. The driving member is configured to drive the plurality of impellers to rotate.

What is claimed is: 
     
       1. A fan assembly comprising:
 a housing; 
 an impeller assembly, wherein at least part of the impeller assembly is accommodated in the housing, and wherein the impeller assembly comprises a plurality of impellers connected in series in an airflow flowing direction of the fan assembly; 
 a driving member configured to drive the plurality of impellers to rotate; 
 a first flow guide member,
 wherein the first flow guide member and an inner surface of the housing define a flow guide channel, 
 wherein the flow guide channel is adapted to guide and discharge output air of an impeller on an upstream side to an impeller on a downstream side, and 
 wherein the first flow guide member has a cross-sectional area decreasing in a direction from the impeller on the upstream side towards the impeller on the downstream side; 
 
 a first bearing; and 
 a bearing seat, detachably disposed on the first flow guide member, having a bearing mounting groove for accommodating the first bearing, wherein an output shaft of the driving member penetrates the first bearing, 
 wherein: 
 a limiting groove for accommodating the bearing seat is defined on an axial end surface of the first flow guide member facing towards the impeller on the upstream side; 
 a through hole of the first flow guide member is defined in a bottom wall of the limiting groove; and 
 the output shaft of the driving member penetrates through the through hole of the first flow guide member, 
 wherein the bearing seat comprises:
 a main body portion, wherein the bearing mounting groove is defined on the main body portion, and wherein a bottom wall of the bearing mounting groove has a bearing seat through hole directly facing the through hole of the first flow guide member; 
 an outer ring portion surrounding an outer periphery of the main body portion and disposed coaxially with the main body portion; and 
 a connection portion, two ends of the connection portion being connected to opposite side walls of the main body portion and the outer ring portion, respectively, 
 
 wherein the main body portion, the outer ring portion, and the connection portion are all embedded in the limiting groove. 
 
     
     
       2. The fan assembly according to  claim 1 , wherein the limiting groove comprises:
 a first limiting groove extending in an axial direction of the fan assembly, wherein the main body portion is accommodated in the first limiting groove, the through hole of the first flow guide member being defined in a bottom wall of the first limiting groove; 
 a second limiting groove extending in a circumferential direction of the fan assembly and formed in an annular shape, wherein the outer ring portion is accommodated in the second limiting groove; and 
 a third limiting groove extending in a radial direction of the fan assembly, wherein two ends of the third limiting groove are in communication with the first limiting groove and the second limiting groove, respectively, and wherein the connection portion is located in the third limiting groove. 
 
     
     
       3. The fan assembly according to  claim 1 , wherein:
 a support post is disposed on a side of the bearing seat away from the impeller on the upstream side, the support post extending away from the impeller on the upstream side in an axial direction of the fan assembly, and the limiting groove defining a support post penetrating hole in which a support column is accommodated; and 
 the first flow guide member comprises an outer limiting protrusion, the outer limiting protrusion being disposed on an outer peripheral wall of the first flow guide member and extending in an axial direction of the first flow guide member, and the support post penetrating hole penetrating the outer limiting protrusion and the first flow guide member body in the axial direction. 
 
     
     
       4. The fan assembly according to  claim 1 , wherein a maximum diameter a of the first flow guide member and a diameter b of the impeller on the upstream side satisfy: 1.05≤a/b≤1.2. 
     
     
       5. The fan assembly according to  claim 1 , further comprising a second flow guide member configured in an annular shape, wherein the second flow guide member is disposed between the first flow guide member and the impeller located on the upstream side of the first flow guide member, and sleeved on an outer side of the impeller on the upstream side to guide output air of an upstream impeller outlet to the flow guide channel. 
     
     
       6. The fan assembly according to  claim 5 , wherein the second flow guide member is radially spaced from the impeller on the upstream side to form an annular gap therebetween. 
     
     
       7. The fan assembly according to  claim 5 , wherein:
 the first flow guide member has a mounting surface, the mounting surface being a surface of the first flow guide member facing the impeller on the upstream side; 
 the second flow guide member comprises a second flow guide member body and a mounting portion disposed on the second flow guide member body; 
 a mounting portion of the first flow guide member is formed on the mounting surface as a first mounting groove; and 
 the mounting portion of the second flow guide member is formed as a second mounting protrusion, and detachably connected to the mounting portion of the first flow guide member. 
 
     
     
       8. The fan assembly according to  claim 7 , wherein the second flow guide member body has a flow guide surface and a pressing-abutting surface, wherein:
 the pressing-abutting surface of the second flow guide member body matches and presses and abuts against the mounting surface; and 
 the flow guide surface of the second flow guide member body is configured to guide the output air of the impeller outlet to the flow guide channel. 
 
     
     
       9. The fan assembly according to  claim 8 , wherein:
 an impeller outlet of the impeller on the upstream side has a lower edge; 
 an inner circumferential edge of the flow guide surface of the second flow guide member body extends to a position adjoining the lower edge of the impeller outlet; 
 an outer circumferential edge of the flow guide surface of the second flow guide member body extends to a junction between the mounting surface of the first flow guide member and an outer peripheral surface of the first flow guide member; and 
 the flow guide surface of the second flow guide member body smoothly transitions to the outer peripheral surface of the first flow guide member. 
 
     
     
       10. The fan assembly according to  claim 8 , wherein:
 an upstream flow guide surface corresponding to the impeller on the upstream side is formed on an inner peripheral surface of the housing, the upstream flow guide surface corresponding to the flow guide surface of the second flow guide member body, and an upstream transition channel being defined between the upstream flow guide surface and the flow guide surface of the second flow guide member body; 
 the upstream transition channel communicates the impeller outlet with an inlet of the flow guide channel; and 
 a cross-sectional area of the upstream transition channel decreases from the impeller outlet to the inlet of the flow guide channel. 
 
     
     
       11. The fan assembly according to  claim 1 ,
 wherein the first flow guide member is adapted to guide output air of an impeller outlet on an upstream side to flow to an impeller inlet on a downstream side at least in the axial direction of the fan assembly, 
 wherein the plurality of impellers is coaxially arranged in the axial direction of the fan assembly, 
 wherein the housing has an accommodation cavity inside and has an air inlet and an air outlet that are in communication with the accommodation cavity, 
 wherein the impeller on the upstream side is disposed adjacent to the air inlet, the air inlet being in communication with an impeller inlet of the impeller on the upstream side, 
 wherein the impeller on the downstream side is disposed adjacent to the air outlet, an impeller outlet of the impeller on the downstream side being in communication with the air outlet, 
 wherein the plurality of impellers at least comprises a first-level impeller and a second-level impeller, 
 wherein the first-level impeller is disposed adjacent to the air inlet, the first flow guide member is disposed on a downstream side of the first-level impeller, the second-level impeller is disposed on a downstream side of the first flow guide member, and an impeller outlet of the second-level impeller is in communication with the air outlet, and 
 wherein each of the first-level impeller and the second-level impeller comprises:
 an impeller cover having the impeller inlet opened in an axial direction of the impeller; 
 an impeller disk, wherein the impeller disk faces and is spaced from a wheel cover in the axial direction of the impeller, wherein an air channel in communication with the impeller inlet is defined between the impeller disk and the impeller cover, and wherein the impeller outlet is formed in a radial outer end of the air channel; and 
 a plurality of vanes arranged at intervals in the air channel in a circumferential direction of the impeller inlet, wherein a number of vanes of the plurality of vanes is N, where 7≤N≤13, wherein any two adjacent vanes in the circumferential direction, the impeller cover, and the impeller disk define an impeller sub-outlet. 
 
 
     
     
       12. The fan assembly according to  claim 11 , wherein an air channel inlet is formed in a radial inner end of the impeller air channel, a width of a first-level air channel inlet of the first-level impeller is B12, and a width of a second-level air channel inlet of the second-level impeller is B22, where B22=c1*B12, and 0.8≤c1<1. 
     
     
       13. The fan assembly according to  claim 11 , wherein the housing comprises a housing body and a cover, wherein the housing body is adapted to match the cover to define the accommodation cavity, the air inlet is formed on the cover, the housing body is detachably connected to the cover, the cover is sleeved on the first-level impeller, the cover defines an annular groove surrounding the air inlet and facing towards the first flow guide member, and an outer circumferential edge of an impeller inlet of the first-level impeller is located in the annular groove. 
     
     
       14. The fan assembly according to  claim 13 , further comprising sealing members, the sealing members comprising a first sealing member and a second sealing member,
 wherein the first sealing member is configured to seal a gap between the annular groove and the first-level impeller, and wherein the second sealing member is configured to seal a gap between an outer circumferential edge of an impeller outlet of the second-level impeller and a cavity wall of the accommodation cavity. 
 
     
     
       15. A vacuum cleaner, comprising the fan assembly according to  claim 1 . 
     
     
       16. The vacuum cleaner according to  claim 15 , wherein the plurality of impellers is located on a same side of the driving member in an axial direction of the fan assembly. 
     
     
       17. The vacuum cleaner according to  claim 15 , wherein at least two impellers of the plurality of impellers are distributed on two sides of the driving member in an axial direction of the fan assembly. 
     
     
       18. The vacuum cleaner according to  claim 17 , wherein:
 the housing has a contraction portion; 
 an impeller on a downstream side is disposed on a downstream side of the contraction portion; 
 an inner diameter of the contraction portion decreases in a direction from the driving member towards the impeller on the downstream side; and 
 a minimum inner diameter e of the contraction portion and an inner diameter d of an impeller inlet of the impeller satisfy: e=d.